How to save persistently secure data in nRF9160 DK?

[Zhenchuan]

hi, 

We are working on nRF9160 DK board.

One of the issues is how to save secure data (e.g, data key) into flash. Is there any examples or document on data storage APIs?

Another follow up issue. Since the Key data is supposed to be  handled in the secure area. I think secure service in SPM is the right place to export the key operations to application. But it looks the project should be either Secure or Non-secure during creation. So how can I create a project/solution that includes both application and our modified SPM secure services? 

Thanks

Zhenchuan

[Martin Lesund]

Hi Zhenchuan,
What you can do is turn OFF the automatic building/merging of the SPM in your main application.

In prj.conf put in:

CONFIG_SPM=n

and make a copy of the SPM (ncs/nrf/subsys/spm/) which you want to modify and build it.

You would build the SPM secure instead of non-secure.

More details in the documentation.

Then you flash the application and SPM separately.

[Zhenchuan]

Hi Martin,

Got it, thanks! That works for me!

Regards

Zhenchuan